The Viaduct was a bridge at Hogwarts Castle. It was constructed of stone, spanned a large chasm, and connected the grounds with the Viaduct Courtyard. There is a safety balustrade made of stone on each side of the Viaduct walkway to prevent people from falling, as well as iron torches to provide lighting.

In the films, althrough it appears in all films, except Deathly Hallows: Part 1, the only time it is seen used is in Deathly Hallows: Part 2 during the Battle of Hogwarts. The same goes for the Boathouse staircase.